This transcript has been automatically generated and may not be 100% accurate.

Oklahoma Prison Execution Goes Wrong

A 38-year-old inmate suffers a fatal heart attack after vein failure from a new drug.

{"id":23540253,"title":"Answers Sought Following Botched Oklahoma Execution ","duration":"10:04","description":"Questions are raised after the execution of death row inmate Clayton Lockett.","section":"US","mediaType":"Default"}